Density-Compensated Level Measurement - Vega VEGABAR 81 Operating Instructions Manual

Measurement setup
VEGABAR 81 • Secondary Device for electronic differential pressure
Fig. 12: Measurement setup for density measurement, h = distance between the
two measuring points
1 VEGABAR 81, Primary Device
2 VEGABAR 81, Secondary Device
The mounting distance " h" of the two sensors should be at least
10 %, better 20 %, of the final value of the sensor measuring range. A
bigger distance increases the accuracy of the density measurement.
Slight density changes cause only slight changes of the measured
differential pressure. The measuring range must hence be selected
accordingly.
Note:
The density measurement is possible in open as well as in closed
vessels.
4.9

Density-compensated level measurement

Keep the following in mind when setting up the measuring system:
•
Mount the Primary Device below the min. level
•
Mount the Secondary Device above the Primary Devices
•
Mount both sensors away from the filling stream and emptying and
protected against pressure shocks from the stirrer
4 Mounting
2
1
21